Muffler



B. L. VlPOND MUFFLER April 14, 1936.

Filed July 1, 1953 Patented Apr. 114, 1936 Benjamin Leslie Vipond.Remington, Md.

Application July l, 1933, Serial No. $18,687

it Claims. (@l. ath-Mill) My invention relates to improvements inmufflers for the exhausts of internal combustion engines or the like.

An important object of my invention is the provision of a mufiler whichwill effectively silence the exhaust without setting up any appreciableback pressure. on the motor or the like.

A further object of my'invention is the provision of a muflier which isof simple and durable construction and which does not have parts subjectto wear and breakage, such as the bafiles in use in many mufllers.

Other objects and advantages oi my invention will be apparent during thecourse oi the iollow= ing description.

In the accompanying drawing which forms a part of this specification andwherein like characters of reference denote like parts throughout thesame, I

Figure 1 is a longitudinal sectional view of a mufller. embodying myinvention,

Figure 2 ispa transverse section through the inlet end thereof,

Figure 3 is a transverse section through a mui "fier formed in twoparts.

Figure 4 11s a fragmentary longitudinal section of amodifled form ofmufiler, and,

Figure 5 is a longitudinal section of a still iur= ther modified form ofmufiler.

In the drawing, wherein for the purpose of illustration is shown apreferred embodiment of my invention, the numeral l0 designates themuffler casing which is substantially conical in shape and is open atits small discharge end which opens into the usual tail pipe H. Thelarge inlet end of the muflier casing is closed and is preferably dishedinwardly as seen at l2 in Figure l. The exhaust pipe l3 enters themufier casing tangentially immediately adjacent the closed end 62 anddischarges the exhaust gases against the side of the casing. Theinwardly dished end of the casing forces the gases to follow the casingin a whirling path, as shown by the arrows in Figure 2 and also preventsthe drumming sound which would. be set up by the exhaust gases causingvibration of the end of the casing were it not dished. Thisdrummingsound can also be pre vented by dishing the casing end outwardly asshown by dotted lines in Figure l.

The muifler casing is provided with a series oi spaced circumferentialgrooves i i arranged a intervals and throughout the length of the caing. Each successive groove is of less diameter approaching thedischarge end of the casing due Y to the tapering of the casing. Theportions oi the casing between the grooves ll' taper toward thedischarge end of the tube and are preferably, but not necessarily,dished inwardly as indicated at it in Figure l. The grooves l4 thereforedivide the casing into a series of successive substantiallyfrusto-conical sections connected with the smaller end of each sectionmerging into the larger end oi the next adjacent section in thedirection of the discharge end of the casing, to form a curved shoulderI6 in front of each groove.

The grooves id, shoulders l6 and connecting portions i 5 are curved tomerge into one another thereby producing a muiiier casing having asmooth wave like contour with no abrupt turns or shoulders.

In operation, the exhaust gases enter the large end of the mufflercasing through the tangentially disposed exhaust pipe i3 and impingeagainst the wall of the casing. The wall of the casing and the bulgedend wall i2 cause the gases to assume a whirling or substantiallycircular' path around the casing, and this whirling path graduallydecreases in diameter, with successive increases in diameter, as the gasapproaches the discharge end of the muilier. This whirling motion of thegases together with the rolling of the gases over the rounded ridges andgrooves of the casing neutralizes the sound waves and thoroughlysilences the exhaust gases without setting up any.appreciable backpressure.

The casing may be formed in any convenient manner. For convenience ofmanufacture the muflier casing may be formed in two half sectionswiththe joints overlapped and welded together as shown in Figure .3.With this construcand a plain substantially cone shaped casing providedas in;- Figure 5. In this form of my invention the tangentially disposedexhaust pipe l3 and the inwardly bulged inlet end wall H are upon toproduce the whirling or the gases through the casing.

While I have shown and described the preferred embodiment of myinvention, is to he understood various changes in the size, shape andarrangement of parts may he resorted to wit-hoot departing from thespirit oi. my inventin or the scope of the suhjoined claims.

Having thus described my invention, what I claim and desire to protectby Letters Patent is:

l. A muilier comprising a substantially co cal casing having a dischargeopening at its smaller end, and an inlet pipe extending tangentiallythrough the casing wall at the larger end thereof, said casing havingcircumferential grooves spaced along its length.

2. A mufiier comprising a substantially corneal shell having a dischargeopening at its smaller end, and an inlet pipe extending tangentiallythrough the casing wall at the larger end thereof, said casing having ahelical circumferential groove extending longitudinally thereoi'.

3. A muffler comprising a substantially conical casing having adischarge opening at its sine end, an inwardly bulged end wall closing to larger end of the casing, and an inlet pipe on tending tangentiallythrough the casing wall ad jacent the bulged end wall thereof, saidcasing having circumferential grooves spaced along its length.

l. A mufiier compiising a substantially conical casing having adischarge opening at its smaller end, an inwardly bulged end wallclosing ii larger end of the casing, and an inlet pipe tendingtangentially through the casing wall a iacent the bulged end wallthereof, said 0 being provided with helical circumferential grooveextending longitudinally thereof.

5. A. muffler comprising a substantially conics" casing having adischarge opening sm end, and an inlet pipe extending tangent l throughthe casing wall at the larger end there of, said casing having a seriesof spaced circumferential grooves and rounded shoulders merg' into eachgroove at the inlet side thereo who by the casing is divided. into aseries co aoevgioe substantially fmsto=corlcai sections, the smallerdischarge end oi each section opening into the larger inlet end of theadjacent section.

6. A muflier comprising a substantially conical casing having adischarge opening at its smaller end, an inlet pipe extendingtangentially through the casing wall at the larger end thereof, saidcasing having a series of spaced circumferential grooves and roundedshoulders merging into each groove at the inlet side thereof, wherebythe casing is divided into a series of connected substantiallyirusto-conioal sections, the smaller discharge end of each sectionopening into the larger inlet end of the next adjacent section, and aninwardly bulged end wall at the larger end of the casing.

l. A muffler comprising a substantially conical casing having adischarge opening at its smaller end, an inwardly bulged en wall closingthe larger end of the casing, an let pipe extending tangentially throughthe casing wall adjacent the bulged end wall thereof, said casingprovided with a helical circuirn i'ential groove extendinglongitudinally thereof, and a helical rounded shoulder merging nto saidgroove throughout its length on the inlet side thereof.

8. .[L rnufier comprising a substantially conical casing having adischarge opening at its smaller end, an inwardly bulged end wallclosing the large oi the casing, and an inlet pipe exd tendingtangentially through the peripheral wall of the casing at itsintersection with the in vlardly bulged end wall whereby gas passingthrough said inlet pipe will be discharged be twee and the peripheralwall of the casing, said casing be grooved to provide longitudinal crosssection a series of restricted portions gradually niergi" I into theother portions of the casing by means of rounded suriac he bulgedportion of the casing end well n

